You stroke another dog and yours appears, wedging between you. You cuddle your partner and the dog climbs onto the sofa. Anyone who lives with dogs has seen this, and everyone calls it jealousy.
Whether it is jealousy in the full human sense is a harder question — and the attempts to answer it have produced some of the more inventive experiments in animal cognition.
The problem with the word
Jealousy in humans is a complex emotion. It requires a sense of self, an awareness of a relationship, and the recognition that a third party threatens it. Some psychologists argue it also involves social comparison and self-evaluation, which would put it beyond most animals.
So researchers distinguish between:
- Primary emotions — fear, anger, joy, disgust — which appear early and are widely shared across mammals
- Secondary or social emotions — jealousy, guilt, pride, shame — which require more complex self-awareness
The interesting question is whether dogs have a simpler, functional form of jealousy: not the full human experience, but a behavioural system that does the same job.
The stuffed dog experiment
The best-known study, by Christine Harris and Caroline Prouvost, adapted a test used with human infants.
Owners were asked to ignore their dog and interact with three things in turn:
- An animated stuffed dog that barked and wagged its tail
- A jack-o’-lantern pail
- A book, which the owner read aloud
The results were clear. Dogs were substantially more likely to push between the owner and the object, to touch or push the owner, and to snap, when the owner was attending to the stuffed dog. Around a third snapped at the stuffed dog; very few did at the other objects.
Most also went behind the stuffed dog to sniff its rear end — which suggests a good proportion of them were treating it as a real dog.
The authors argued this fits a functional jealousy system: the behaviour is triggered specifically by a perceived social rival, not by any loss of attention.
The criticisms
Not everyone was convinced, and the objections are reasonable.
- The behaviour could be simple attention-seeking rather than rivalry. The stuffed dog was moving and barking, which is more interesting than a book
- It could be frustration at being ignored
- The dogs may have been responding to the novelty of an odd object
- “Jealousy” as a label imports assumptions the data does not establish
A later Auckland study addressed some of this by using a barrier: dogs strained hard to reach their owner when the owner appeared to interact with a fake dog behind the barrier, but much less when the owner interacted with a fleece cylinder — even though the dogs could not see the interaction. That is harder to explain by simple attention-seeking, because the dogs were responding to an inferred social interaction rather than an observed one.
What can be said reasonably
Dogs behave in ways that function like jealousy: they intervene in interactions between their attachment figure and a perceived rival, and they do it more when the rival is dog-like.
Whether there is an inner experience resembling human jealousy is not answerable with current methods, and honest researchers say so.
Living with it
Whatever we call it, the behaviour is real and it can become a problem — particularly in multi-dog households, where competition over an owner’s attention is a common flashpoint.
Do not punish it. A dog told off for pushing in is a dog who learns that the other dog’s presence predicts trouble, which is exactly how genuine inter-dog tension develops.
Teach an alternative. Pay the dog for lying on a mat while you attend to the other dog. Over time, the other dog getting attention becomes a cue that food appears for staying put — which flips the association.
Give individual time. One-to-one walks and training sessions with each dog reduce competition more than anything else.
Feed and give chews separately, always. Resource competition around an owner is much more likely to escalate when food is involved.
Watch for stiffening, freezing or hard stares between dogs during these moments. Those are the signals that precede real conflict, and they are worth taking seriously early.
And the guilty look
While we are here: the other famous “complex emotion” dogs are credited with does not survive testing. Alexandra Horowitz’s experiment showed that the guilty look appears reliably when an owner scolds a dog, regardless of whether the dog actually did anything — and dogs who were innocent but scolded looked *guiltier* than dogs who were guilty but not scolded.
The look is a response to your body language now, not a memory of wrongdoing. Which is worth remembering the next time you come home to a chewed shoe.
